use rowClass instead of collect

[vonbecmann]

fix: #86
add SQLite3Column>>#cid: and SQLite3Column>>#notnull:
those accessor are use by the cursor to initialize the column

[codecov]

Codecov Report

Patch coverage: 100.00% and project coverage change: -0.04% ⚠️

Comparison is base (1592f72) 80.04% compared to head (0a08252) 80.00%.

Additional details and impacted files

@@            Coverage Diff             @@
##           master      #87      +/-   ##
==========================================
- Coverage   80.04%   80.00%   -0.04%     
==========================================
  Files         108      108              
  Lines        4359     4356       -3     
==========================================
- Hits         3489     3485       -4     
- Misses        870      871       +1     

Files Changed	Coverage Δ
src/SQLite3-Core/SQLite3Column.class.st	92.15% <100.00%> (-7.85%)	⬇️
src/SQLite3-Core/SQLite3Table.class.st	100.00% <100.00%> (ø)

... and 2 files with indirect coverage changes

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